I very much like this idea. Hopefully it can be implemented. The only issue I could see is that the price has to be the same for all items, but that should be fine if you're selling things like similar horse eggs or enchanted books.

Definitely possible. We have something planned better than the suggestion though. Don't have all of the details figured out yet, but it will be a preview sign shop. It would ideally work with the prices shown in the item lore.